Fe_(0.02)/Ag_(x)-ZnO复合材料的合成及其光催化活性  

Preparation of Fe_(0.02)/Ag_(x)-ZnO composites and their photocatalytic properties

作　　者：王远港 王有杰 孙铖 赵显一 WANG Yuan-gang;WANG You-jie;SUN Cheng;ZHAO Xian-yi(College of Chemistry and Materials Engineering,Bohai University,Jinzhou 121013,China;Jinzhou Chensheng Science and Technology Co.,Ltd.,Jinzhou 121013,China)

机构地区：[1]渤海大学化学与材料工程学院,辽宁锦州121013 [2]锦州晨晟科技有限公司,辽宁锦州121013

出　　处：《陕西科技大学学报》2025年第1期88-100,共13页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21878024);辽宁省锦州市指导性科技计划项目(JZ2020B032)。

摘　　要：采用水热合成法及煅烧法,制备了不同掺杂量的Fe_(0.02)/Ag_(x)-ZnO复合材料,并考察了各催化剂对RhB光催化降解活性.机理分析表明,Fe掺杂进ZnO,Fe^(3+)可以形成陷阱捕获e-,导致ZnO的导带下方形成一个Fe掺杂能级,促使缩短了ZnO的带隙,扩大了光谱响应范围;Ag的掺入促使部分电子(e^(-))跃迁到Ag单质上,减小了禁带宽度,降低了电子跃迁所需的能量,抑制了e^(-)-h^(+)的复合,Fe_(0.02)/Ag_(x)-ZnO样品的新费米能级低于Fe-ZnO和ZnO的导带能级,导致其界面处的电荷分离;进一步研究Fe_(0.02)/Ag_(x)-ZnO复合材料对染料罗丹明B(Rhodamine B,RhB)的光催化降解性能和循环使用性能.结果表明,Fe_(0.02)/Ag_(x)-ZnO复合材料可作为一种稳定、高效且可循环的光催化剂材料并用于污水处理,拓展了Fe_(0.02)/Ag_(x)-ZnO复合材料的应用.Fe_(0.02)/Ag_(x)-ZnO composites with different doping amounts were prepared by hydrothermal synthesis and calcination methods,and the photocatalytic degradation activity of each catalyst for RhB was investigated.The mechanism analysis showed that:Fe doping into ZnO,Fe^(3+)can form a trap to capture e-,leading to the formation of an Fe-doped energy level below the conduction band of ZnO,which prompted the shortening of the bandgap of ZnO and the expansion of the spectral response range;Ag doping contributed to the part of the electrons(e^(-))leaping to Ag singlet,which reduced the forbidden bandwidth,lowered the energy required for the electron leaps,and the composite of e^(-)-h^(+)was inhibited.The new Fermi energy levels of the Fe_(0.02)/Ag_(x)-ZnO samples are lower than the conduction band energy levels of Fe-ZnO and ZnO,leading to charge separation at their interfaces.The photocatalytic degradation performance and recycling performance of Fe_(0.02)/Ag_(x)-ZnO composites for the dye Rhodamine B(Rhodamine B,RhB)were further investigated,and the results showed that Fe_(0.02)/Ag_(x)-ZnO composites can be used as a stable,efficient and recyclable photocatalyst material and for wastewater treatment,which expands the application of Fe_(0.02)/Ag_(x)-ZnO composites.

关 键 词：电子跃迁 费米能级 禁带宽带 光催化 

分 类 号：TB332[一般工业技术—材料科学与工程]